Attachment for wetting calender-rolls of paper-making machines.



No. 638,757. Patented Dec. l2, I899. a. 'r. PRATT.

ATTACHMENT FOB WETTING CALENDEB BULLS OF PAPER MAKING MACHINES.

(Application flied July 6, 1899.)

(No Model.)

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UNITED STATES PATENT OFFICE.

GEORGE T. PRATT, OF W'INDHAM, MAINE.

ATTACHMENT FOR WETTING CALENTJER-ROLLS OF PAPER-MAKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 638,757, dated December12, 1899.

Application filed my 5,1899. Serial No, 722,310, (N d l) T0 at whom itmay concern:

Beit known that I, GEORGE T. PRATT, a citizen of the United States ofAmerica, and a resident of Windham, Cumberland county, State of Maine,have invented certain new and useful Improvements in Attachments forTVetting Calender-Rolls of Paper-Machines, of which the following is aspecification.

My invention relates to an attachment to be applied to thecalender-rolls of paper-machines for wetting the face of such rolls whena water-finish, so called, is to be applied to the paper.

Ihave devised this attachment particularly to be used in paper-machinesmaking thick paper or wood-board, in which the paper or board is made upof several layers; but it may be applied to any paper with good results.

In the accompanying drawings I have illustrated the form of my inventionwhich 1 actually use and prefer; but it will be understood that otherforms may be devised while keeping within the limits of the invention.

Figure 1 of the drawings shows the general form of a stack ofcalender-rolls locking at their ends and with one side of the frameremoved and with my attachmentapplied, and Fig. 2 is a front elevationof the same.

A represents the calender-rolls, and B is the frame. The water ormoisture is applied to one of the rolls by a wetting-roll O, which iswound, preferably, with a layer of felting or with a layer of thin clothon the outside, thereby producing an absorbent surface. One side of theroll 0 rests on and runs in contact with the calender-roll above itscenter, while the other side rests on and runs in contact with afeed-roll D, which is journaled in a water-box E,where it runs in water,the waterbox being secured by its ends to the sides of the frame. Theroll D has its surface covered with pervious material, the same as theroll 0. The water in the box E is kept at a constant level by means of asupply-pipe f and an overflow-pipe e, which latter may be raised andlowered to vary the level of the water according to the amount desiredon the face of the calender-roll. The wetting-roll O is here shown asweighted with weights, one

at each end, suspended from the journal of the roll by rods 0, and bychanging these weights a greater or less pressure may be put on the rolland the roll may be run more or less damp, according to the pressure.The amount of water put on the face of the calender-roll can thus beregulated in two ways" first, by the depth of water in the water-box,and, second, by the weights on the roll 0-.

In order to prevent any surplus water running from the roll 0 down theface of the calender-roll and dropping on the paper below, I place awiper h beneath the roll 0 and in contact with the face of thecalender-roll. This wiper is a rod of absorbent material, here shown ascylindrical in form. If any water gets by the wiper, it is caught by thedrip-pan g, which is secured to the under side of the water-box, and ithas an edge which runs in contact with the calender-roll.

The attachment is here shown as applied to one roll; but it is evidentthat when it is desired to finish both sides of the paper a likeattachment is applied to the other side of the stack of rolls.

The water-finish which is applied to the paper by the use of thisinvention gives to the paper a smooth surface, prevents the breakage ofthe paper, and it enables the calenderrolls to be run light or withlittle weighting, and thus produces a board of smooth finish andrelatively great thickness, which is to be desired in the manufacture ofthis kind of paper.

I claim The combination with one of the calender= rolls of apaper-machine of a water-feed roll adjacent to said calender-roll andparallel therewith, a wetting-roll resting on and run= ning in contactwith said calender and feed rolls, weights attached to the journal ofsaid wetting-roll and means for supplying water to said feed-roll.

Signed by me at Portland, Maine, this 30th day of June, 1899.

GEORGE T. PRATT.

Witnesses:

S. W. BATES, J. O. FOSTER.

